20h48m11.9s, −19° 50′35″| HCG 87 | |
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Galaxy Group HCG 87
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| Observation data (Epoch ) | |
| Constellation(s) | Capricornus |
| Right ascension | 20h48m 11.9ss[1] |
| Declination | −19° 50′ 35″[1] |
| Number of galaxies | ~5 |
| Redshift | 8874 km/s[1] |
| Distance | 400 million |
| See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters | |
HCG 87 is a compact group of galaxies listed in the Hickson Compact Group Catalogue. This group is about 400 million light-years away [2] in the constellation Capricornus. The group distinguishes itself as one of the most compact groups of galaxies, hosting two active galactic nuclei and a starburst among its three members, all of which show signs of interaction.[3] This interaction, which astronomers have called visually, and scientifically, intriguing[4] is being examined to understand the influence of active nuclei on star formation histories.
| Name | Type[5] | R.A. (J2000)[5] | Dec. (J2000)[5] | Redshift (km/s)[5] | Apparent Magnitude[5] |
|---|---|---|---|---|---|
| HCG 87a | S0 pec | 20h48m 15.0s | −19° 50′ 58″ | 8443 ± 14 | 15.3 |
| HCG 87b | SA(r)0 pec | 20h48m 10.9s | −19° 51′ 23″ | 8740 ± 20 | 15.4 |
| HCG 87c | Sb | 20h48m 12.0s | −19° 49′ 56″ | 8914 ± 7 | 16.1 |
| HCG 87d | Sd | 20h48m 12.8s | −19° 50′ 46″ | 10200 ± 160 | 17.8 |
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